Stamp-mill.



' no. 668,578. Patented Feb. l9, mm.

a; L. mason.

STAMP MILL.

(Appliation filed July 2, 1900. (N L) 4 Sheets-Sheet l.

(I 3 MIZGGFGGQY Mimi? WW 1 a Patented Feb. I9, 190i.

[11. L. GIBSON.

STAMP MILL. (Application filsd July 2, 1900.

4 SheetsSheet 3,

(No Model.)

THE NORRIS PETERS ca, Pnoruu'ma, mnsuluc'mn. mu

1. IL 0L S BMJ d M m m Tm a (No Model.)

4 Sheets-Sheet 4.

"WI W- Hill UNITED STATES PATENT Orrtcn.

GEORGE L. GIBSON, OF DENVER, COLORADO, ASSIGNOR OF THREE-EIGHTHS TO J. W. LATIMER AND PETER P-AULSEN, OF RAWLIN S, WYOMING.

STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 668,578, dated February 19, 1901. Application filed July 2, 1900. Serial No. 22,250. (No model.)

To all whom it may concern: Be it known that I, GEORGE L. GIBsoN, a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Oolorado, have invented certain new and useful Improvements in Stamp-Mills, of which the following is a specification.

My invention relates to certain improvements in stamp-mills, the object of which is to make a compact efficient mill with an even feed and designed with especial reference to its neatness, durability,and ease of operation.

To such end the invention consists in certain characteristics of novelty below described and claimed.

In the drawings, Figure 1 is a side elevation; Fig. 2, a diametrical section in line 2 2 of Fig. 3; Fig. 3, a plan; Fig. 4,-a horizontal section looking downward upon the plane 4 at 2c of Fig. 1; Fig. 5, a detail vertical section in line 5 5 of Fig. 3 looking in the direction of the arrow 5; Fig. 6, a view looking in the direction of the arrow 6 of Fig. 5 at the parts shown in said Fig. 5. Fig. 7 is a vertical section in the plane 7 7 of Fig. 2 looking downward and partly broken away. Fig. 8 is a perspective of the end of the feed-spout and a portion of the feed-trough. Fig. 9 is a horizontal section looking down ward upon the plane 9 9 of Fig. 1, and Fig. 10 is a detail veriical section in line 10 10 of Fig. 9.

Referring to the drawings, A is a circular framework containing four uprights a and three horizontal rings a a (L The lower 5 ring a contains sockets a to receive a series of dies B, between which and a series of stamp-heads O the ore is to be pulverized. These stamp-heads are hung upon stems c, guided in the rings a 0, the portion within the ring a being preferably non-circular to prevent the rotation of the stems in their guides. The chamber in which the stamps work is called the mortar, and its inner wall is formed by an upwardly and inwardly converging plate D, preferably cylindrical at the bottom (Z ,to fit the inside of the ring a and also cylindrical at the top d to, form the inner wall of the feed-trough. The outer wall of said feed-trough is formed by the innor depending wall 6 of hood or cover E, perforated to allow the stamp-stems to reciprocate therein and extending downward upon 'the outside to about the level of the feedtrough, the space below this cover being in closed by means of four screen-frames F, held in place by keys f, wedged between the frames and outwardly-extending hooked plates f, secured to the uprights a. The uprights divide the mill into four batteries, as here shown, each containing five stamps. At the tops of the stems c are adjustable sleeves 0', extending inward from which are a series of riders 0 upon the inner sides of which are journaled antifriction-rollers 0 A central shaft G is vertically journaled in suitable bearings-as, for instance, the end sockets g gand is rotated by means of gears g g from a shaft g driven by a pulley g Upon the shaft G is secured a disk K, around the outer periphery of which are a series of double cams It, the inner portions of which it engage the rollers 0 to .raise the stamps and the outer portions of which 10 extend slightly beyond the inner portions to engage the riders c and hold the stamps up until the rollers are entirely clear of the inner portions, as is shown clearly in Fig. 5. This is done to give what is known as a flat drop to the stamps, which would not be possible if the rollers were allowed to roll off of the upper corners of the cams. The disk K is rotated in the direction shown by the arrow in Fig. 3, which is the proper direction to crowd the cams under the rollers. The stems c are shown as provided with circumferential ribs 0 c and hinged props H are shown as leaning inward against the rod h, which may be conveniently drawn outward beneath either of the ribs 0 c to hold the stamps upward out of operation when desired. Upon the ring a is supported a funnel-shaped hopper M, provided with a perforated bottom m, (see Fig. 7,) and beneath the hopper a feedspout N is fastened to the shaft, having a perforated top 11 and extending downward 5 and outward until it terminates in a springpressed end n, resting on the feed-trough. This end is shown as telescoping within the end of the feed-spout and is pressed downward by springs n is secured to the cover E, opposite the top of the feed-trough, to receive the end of the A ledge 0 (see Fig. 8) I00 feed-spout and also to support an adjustable partial cover 0, by means of which part of the feed-trough maybe covered up when one or more batteries are thrown out of motion to prevent the delivery of the ore into the areas occupied by said batteries.

The ore is delivered by any suitable means between the stems cinto the hopper M. From the hopper it passes by an even flow through the openings in the bottom of said hopper and in the top of the feed-spout into said spout, and as the end of said spout is carried around the feed-trough itis distributed evenly throughout said trough, passing downward into the mortars to the stamps. Great conven ience of distribution is thus accomplished, together with compactness of arrangement and remarkable efficiency due to the working of each battery up to its limit without the clogging of any.

If it is desired to operate only a part of the batteries, the stems of the stamps of the battery or batteries thrown out of operation may be raised and held up by the corresponding props H, and the mortar section or sections thus withdrawn from use may be closed by the use of one or more of the partial covers 0 O. The end of each partial coverO is beveled, as shown in Fig. 8, so that the springpressed end 12. ot' the feed-spout N may slide upward over the end of the cover and may thus be moved along the cover and held closed thereby until it reaches an open mortar-section, when the discharge of ore will again begin. As the ore is pulverized in any or all of the mortar-sections it is free to pass outward through the corresponding screens F and may thus escape from the mortar either as a dry powder or mixed with water discharged into the mortar-sections for the purpose of facilitating the outward movement of the finely-divided ore.

Rubber butters Rare shown as resting upon the ring a and encircling the stems 0. These butters are adapted to receive the shock caused by the dropping of the stamps should any of the disks B be removed for any cause. The ribs 0 will then strike upon the rubber butters, preventing the rollers c from striking upon the disk K and breaking it.

I recognize the possibility of great variation in many of the details, and for that reason do not limit myself to the specific construction herein shown and described.

I claim as new and desire to secure by Letters Patentl. The combination with a suitable framework, ofa series of circularly-disposed stamps having stems vertically guided in said framework, a centrally-journaled rotating disk provided with double vertical cams about its periphery, and a series of rollers and riders secured to the said stems and so arranged with relation to said double cams, that one part of each cam passes under the successive rollers and the other part of each cam passes tinder the successive riders, whereby the stems are lifted, through the operation of said cams upon the rollers, and are supported, by means of said riders, until after the rollers are completely free from the cams.

2. The combination with a suitable framework, a series of circularly-disposed stamps having their stems vertically guided in said framework and means for raising and dropping said st-amps, of an annular feed-trough communicating with the annular mortar, in which said stamps operate, a suitable orehopper, a rotating feed-spout communicating at its upper end with said hopper and at its lower end with said feed-spout and a partial annular cover adapted to close any desired portion of said feed-trough, the lower end of said feed-spout being, adapted to move over said partial coverand to be closed thereby, whereby the flow of ore to the portion of the annular mortar corresponding to said closed feed-trough section may be interrupted, and such portion of the mortar may be temporarily inoperative.

3. The combination with a suitable framework, a series of -circularly-disposed stamps having stems vertically guided in said framework and means for successively raising and dropping said stems and stamps, of a hopper, an annular feed-trough adapted to supply ore to said stamps, a partial cover adapted to close any desired portion of said feed-trough, and a feed-spout communicating at its upper end with said hopper and at its lower end with said feed-trough, the lower end of said feed-spout being longitudinally contractible, whereby the spout is adapted to pass over said partial cover when the latter is in place on the feed-trough.

In witness whereof I have hereunto set my hand, at Grand Island, in the county of Hall and State of Nebraska, this 26th day of June, A. D. 1900.

GEORGE L. GIBSON.

Witnesses:

JAs. H. FOLEY, GEO. H. MCDONOUGH. 

